Troubleshooting 12V Power Circuit on 7-Way on 2008 Chevy Silverado 2500 Duramax
Updated 06/07/2017 | Published 06/05/2017 >
Question:
I have a 2008 chevy Silverado 2500 duromax. I am not getting aux power to the plug in the bumper. I have power at the pole infant of the fuse box. Is there a fuse in the line somewhere?
asked by: Gene
Helpful Expert Reply:
Under the hood of your 2008 Chevrolet Silverado there is a connection required for activating the 12V auxiliary power feed on the 7-way. The ring terminal for the 12-volt power lead for the 7-way trailer connector is located to the left of the power distribution box. It is taped to a wire harness under the power brake booster. Cut the tape to release it from the harness. Then run the wire to the front of the power distribution box and hook the ring on the right post. You can refer to the linked article that covers this process.
If the 12V circuit has worked previously but has now stopped you may have a corrosion issue inside the 7-way socket or in the connector that plugs into it. Check both for any signs of discoloration, corrosion or trapped dirt or water that could be causing a short-circuit of the trailer power feed.

Product Page this Question was Asked From
Adapter 4-Pole to 7-Pole and 4-Pole
- Custom Fit Vehicle Wiring
- Wiring Adapters
- Universal Fit
- 7 Blade to 4 Flat
- Plug and Lead
- Hopkins
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Suspension Enhancement
- Shop: Timbren Suspension Enhancement System - Severe Service - Rear Axle
- Q&A: Adapter and Re-Wiring Kit for Lance Truck Camper with Round Pin 7-Way Plug
- Shop: SumoSprings Maxim Custom Helper Springs - Rear Axle
- Shop: Firestone Ride-Rite Red Label Extreme Duty Air Helper Springs - Rear Axle
- Shop: SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 5K to 8K - Overslung
- Shop: SumoSprings Maxim Custom Helper Springs - Rear Axle
- Shop: Replacement Magnet Kit for 7" Electric Trailer Brake Assemblies - 2,000 lbs
- Q&A: Location of Trailer Running Lights Fuse on a 2008 GMC Sierra
- Article: Aftermarket Brake Control Wiring for 07-13 GM Full-Size Truck with Factory-Integrated Brake Control
- Article: How to Mount a Truck Bed Camper
- Q&A: 7-Way Trailer Plug Adapter or Compatibility with Lance Slide-In Truck Bed Camper
- Shop: Trailer Hitch
- Search Results: suspension enhancement
- Video: Choosing the Right Vehicle Suspension Upgrades
- Q&A: What Is An OEM Prep Package And How Do I Know If I Have It
- Search Results: airbags
- Article: Choosing the Right Suspension Kit for Your Truck and Trailer
- Q&A: Comparing Air Springs And Jounce Springs For A 2022 Chevy Silverado DRW 4x4
- Search Results: air bag compressor kit
- Article: Trailer Wiring Diagrams
- Shop: Firestone Ride-Rite Air Helper Springs - Double Convoluted - Rear Axle
- Search Results: timbren vehicle suspension
- Shop: Trailer Wiring
- Article: Best Air Bag Suspension (2023)
- Article: Stability Control for Heavy Duty Vehicles
- Search Results: trailer suspension parts
- Q&A: 2025 GMC Sierra 2500 5th Wheel Hitch Recommendation for OEM Puck System and 6-1/2' Bed
- Video: Hands-On with the SumoSprings Trailer Helper Springs w/ Line Relocation Bracket
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)